What is bat-story-eval?

A testing workflow that compares how MCP tools behave in two versions. MCP is a standard way for AI assistants to use external tools.

It is for testing tool changes against a baseline version, running selected or all test stories, and investigating results with different agents.

It helps identify behavior changes after code updates and focuses review on the stories most affected by the differences.

How harry189/ha-mcp configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to harry189/ha-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/harry189/ha-mcp/chore/gate-demo-throwaway/.claude/skills/bat-story-eval/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/harry189/ha-mcp

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/harry189/ha-mcp/bat-story-eval/github.svg)](https://agentmods.dev/skills/harry189/ha-mcp/bat-story-eval)

Your own site

<a href="https://agentmods.dev/skills/harry189/ha-mcp/bat-story-eval"><img src="https://agentmods.dev/badge/skills/harry189/ha-mcp/bat-story-eval/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/harry189/ha-mcp/bat-story-eval"><img src="https://agentmods.dev/badge/skills/harry189/ha-mcp/bat-story-eval.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 26 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 3,305 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin 91% copy Near-identical to another mod in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00026	$0.03305
Opus 5	$0.00013	$0.01653
Sonnet 5	$0.00005	$0.00661
Haiku 4.5	$0.00003	$0.00331

Measured 10d ago against content hash 8022d4d10acc, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

bat-story-eval scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 10d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

This is a copy

91% identical to bat-story-eval — 22 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

.claude/skills/bat-story-eval/SKILL.md · 366 lines

How it starts

The opening of the file, as written. The whole thing — 366 lines — stays where its author put it; the contents beside it link to each section on GitHub.

BAT Story Evaluation

You are the evaluator. Follow these steps IN ORDER. Do not skip steps.

Parse Arguments

From $ARGUMENTS, extract:

--baseline: REQUIRED. Git tag/branch of the released version (e.g., v6.6.1).
--agents: Agent list (default: gemini). Comma-separated.
--stories: Force specific pre-built story IDs (e.g., s01,s02). Overrides triage selection.
--all-stories: Skip triage, run ALL pre-built stories.
--keep-container: Keep HA containers alive after run for manual inspection.
--model: Model for Claude agent (e.g., haiku, sonnet).

If $ARGUMENTS is --help or missing --baseline, show usage and stop:

/bat-story-eval --baseline v6.6.1
/bat-story-eval --baseline v6.6.1 --agents gemini,claude
/bat-story-eval --baseline v6.6.1 --stories s01,s02
/bat-story-eval --baseline v6.6.1 --all-stories --agents claude --model haiku

Step 0: Triage (Diff Analysis + Custom Story Design)

0a. Compute Diff

cd /home/julien/github/ha-mcp/worktree/uat-stories
git diff <baseline>..HEAD -- src/ha_mcp/ --stat
git diff <baseline>..HEAD -- src/ha_mcp/ --name-only

Classify changed files:

Tool modules (tools/tools_*.py): specific tool implementations changed
Core code (client/, server.py, errors.py, tools/util_helpers.py): affects all tools
Utilities (utils/, resources/): may affect all tools
No src/ changes: only tests/docs/config — select 2 smoke-test stories

0b. Select Pre-built Stories

Skip if --stories or --all-stories was passed.

Read the diff from 0a
Read all story YAMLs in tests/uat/stories/catalog/s*.yaml (title, description, prompt, setup)
For each story, reason about whether the diff could affect its outcome:
- What tools/code paths would this story exercise?
- Do any of those overlap with what changed?
Rules:
- Story likely exercises changed code -> selected
- Core code changed (client/, server.py, errors.py) -> all stories selected
- No src/ changes -> 2 representative stories as smoke test
Report which stories were selected and why (one sentence per story)

Read the full file on GitHub · 366 lines

Files

What ships with it

2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

10d ago First seen · 366 lines · 26 tokens per session scan A 8022d4d10acc

Subscribe to this mod's changes

bat-story-eval is a skill published in the GitHub repository harry189/ha-mcp (0 stars, last pushed 1mo ago), licensed MIT. It adds 26 tokens to every session and 3,305 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. It is 91% identical to bat-story-eval, differing in 22 lines, and is treated as a copy.

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ha-mcp: Skill for Claude Code